they require a wireless technology that only some stores can use. >> some apps only link with a few credit cards so you may need to link to a prepaid card which can incur additional fees. that may mean you don't have the best protection if you lose your phone or someone breaks in to your account. >> prepaid cards whether in your hand or on your phone have no guaranteed protection against unauthorized transaction sow could lose whatever balance is on the cards. >> if, like her, you like to leave the wallet at home security is best when it is linked with a credit card. >> report a lost phone or suspicious activity to the credit card company right away. of course, inform your cell phone carrier so they can disable the phone. >> still ahead at 6:30 we have breaking news from texas on the devastating explosion that flattened a fertilizer plant. >> we will go to texas for the latest on efforts to fine missing residents after the fiery blast. >> three men robbed this macy's while it was open. find out what they did next. >> a live look from sutro tower a high definition picture with temperatures